# Is it possible to calculate the prices of stock market trends with calculus?

1. Oct 4, 2005

### QuantumTheory

My grandpa is an investor . I heard some people get rich off the stock market.

Is it possible to predict stock market prices?

thank you

2. Oct 4, 2005

### Pengwuino

It is not possible to predict stock market prices and it is DEFINITELY not possible to calculate them using calculus.

The problem with mathematically deducing what a stock will do is that the stock market does not follow equations or anything like that. The "variables" in the stock market are beliefs, feelings, instincts, etc instead of ratios and constants and such. It is kind of like asking if you can mathematically predict love using calculus. Is there an equation that will tell you if someone will fall in love with you? No. Same with the stock market.

People get rich off the stock market for various reasons. An extremely extremely extremely small # of people get lucky and throw money into a stock and become rich because the stock just happens to take off. A majority of people however, get out after losing or gaining a few dollars/share. A lot of people throw their money in and the stock falls and they just think its going to go back up one day but it never does and they lose a large portion of their money. A small number of people center their lives around the market however. They look at tremendous amounts of information related to specific stocks they are researching to determine how the stock might turn out and make various judgement calls and act on those calls. Those are the people who really get rich off the stock market.

Another group of people that gets rich however, are corporation presidents/CEO's. For example, we'll use Bill Gates. The reason he is rich is because Microsoft was his company. Once they went public and offered shares, Bill Gates had a large portion of the shares of the company; a large % to be exact. As Microsoft grew to have a networth higher then many countries do, Gates effectively became worth the $50 billion or whatever he's worth now (or is it 10, i dunno). This is because say, if he had stock of 50% of the company and the company was worth$100 billion, he is effectively worth \$50 billion. The thing is however... he doesn't really have this cash accessible. He would have to sell his stock which means he sells off portions of his ownership in the company.

There is one good example of what the real stock market works off of, beliefs. If Bill Gates started selling off large # of stocks, people will start believing and speculating that something is wrong with the company. This will mean that the stock share will command a lower price on wall street because it is no longer as good of a company as people think it is. Conversely, if some big wall street brokerage starts buying up shares of Microsoft, people will start thinking Microsoft is becoming a better company and closer to achieving its goals of world-wide domination. Thus, a good stock to get into.

Another implication of this system is that brokerage houses can literally destroy companies or pull failing companies out of the grave. For example, I believe Krispee Kreme went through this. Brokerage houses and investors had large amounts of money in the company (I may be wrong as to which company im thinking of though). They said they were going to expand and everything was going to be great. Well they hit the west coast and they weren't successful. The investors, who held tremendous amounts of stock in KK, realized the company wasn't worth it so they all sold off. KK's stock price then tumbled. For many companies, this action could very well destroy them. Converseley, a company can be pulled out of the ground because of a large brokerage house or large investors. I can't really think of an example right now but what basically might happen is that a brokerage house might start buying up shares of a company like crazy. This would mean the company has a larger networth now. They could also see this and issue more stock and raise capital to expand the company. Since the brokerages think its a good company, they can gain a large amount of money through stock issuance (the company that is).

3. Oct 4, 2005

### FredGarvin

Don't you think if it were possible, there would be some very very wealthy people out there?

4. Oct 4, 2005

### Anttech

Most brokerages are using Mathimatical alogriths to help them deside when to invest and when to withdraw stocks...Also when assembeling your portfolio mathimatics can help you minimise risk on a certain gain. Investors also look at GARP to determine what is a wise investment and what isnt.

Last edited by a moderator: May 2, 2017
5. Oct 4, 2005

### Tom Mattson

Staff Emeritus
Yeah, jeez, if it were possible to do that, I wouldn't be sitting around here talking to you people. :tongue2:

6. Oct 4, 2005

### Lisa!

We had a very knowledgable professor who hardly spent time to answer students' questions out of the class( I was an exception of course ). he was always sitting in front of his computer and we thought he was sutudying physics articles, but once 1 of his student had discovered that actually he was visiting a stock market site! And I should tell you he was really rich ,although he was only 35! So yes, it might be possible and you...:tongue2:

7. Oct 4, 2005

### vanesch

Staff Emeritus
I know some people who TRY to do this. In fact, this business used to be an attraction pole for physicists-out-of-their-25th-postdoc. Of course it is difficult to predict individual stock prices, but they try to find some correlations between stocks in order to be able to predict short-term moves. I knew some people (I don't know if they were very successful) who just tried to fit big neural networks onto a lot of stock data, with the hope that the neural network would fit onto the correlations. But of course, major events are never included into this. The result of elections or so cannot be foreseen. You can only hope to find some short range correlated dynamics (if the course of oil companies goes up, then maybe a few days later, the course of car manufacturers goes down or something like that). That can be enough to make small margins, and if you have enough money to bet onto your model, you can make bucks with it.

However, another known truth is that such a model cannot be generally known. If it were, the market would ALREADY correct for it by all those greedy nerds all over using their model, and as such, no margin would be left.

8. Oct 4, 2005

### Physics_wiz

I read somewhere that stock prices are chaotic, which implies that they are very sensitive to initial conditions. If anyone figured out a pattern and tried to draw a profit out of it, they would fail because they would change the initial conditions.

9. Oct 4, 2005

### QuantumTheory

Thanks for the great post Pengwuino
PHysics whiz, do you know alot about physics?

I'm 17 and dont know what to do yet, and I hope this will help me decide,thanks!

Pengwuino I will ask you more questions on stock by PM, is that ok with you?

10. Oct 4, 2005

### Physics_wiz

It looks like we have some stuff in common . Well ok, first, I don't really know much about physics. I created this account when I was in high school and was pretty good at my AP physics class. Right now, I'm in engineering...still know some physics but not much. I recently got interested in stocks and the stock market too and got a few books. I even decided on buying a few SPY shares for now until I read up more on the stock market. If you have stock questions, post them here! I'd be happy to discuss them or learn something new from the thread. Guess what? When I first started, I downloaded a few spreadsheets of data to check for any trends...I was a bit stupid. Anyways, read a few books on the stock market, they help a lot. Also, I found "Fooled by Randomness" to be an awesome book. It won't teach you much, but the author makes some very good points (pay attention to what he says) that most 17 years old or 19 years old (me) people don't know about.

11. Oct 5, 2005

### fourier jr

ya if it were possible to use calculus to get rich off the stockmarket wouldn't literally everybody who follows that stuff make a killing? it's like asking if statisticians & probabilists know any tricks to use at a casino.

12. Oct 5, 2005

### QuantumTheory

Heh I am interested in alot of things right now. mostly numismatics, and physics (time dilation and general and special relativity) its one of those things i just want to know without having to understand all the complex equations (if you think this is possible, let me know) and economics. Are there any jobs you can do with a degree in economics? do you know of any good books on stocks for beginners?
thanks

13. Oct 5, 2005

### Pengwuino

Sure, i'll try to do my best to not screw up your understanding :D

14. Oct 5, 2005

### Pengwuino

But there is tricks to use at the casino!!!

Except that its a bit difficult and casinos look for people who are doing it and kick them out.

15. Oct 5, 2005

### cronxeh

There are a few tools like Stochastic models and derivative pricing, Ito calculus, Black-Scholes partial diff eq model, Heath-Jarrow-Morton (HJM), Hull-White (HW), Monte Carlo, Black-Karasinski (BK), Cox-Ross-Rubinstein (CRR) for option pricing, Equal Probabilities Tree, Crank-Nicolson, Black-Derman-Toy (BDT), Brace-Gatarek-Musiela, Ho-Lee

16. Oct 7, 2005

### fuzzyfelt

Hi Guys - this is Husband Of Fi: darling wife brought this thread to my attention since i have only ever worked in stock markets, and thats for 15 years now.
I think the biggest issue for modelling markets is the almost infinite number of variables (each participant is a variable in themselves!). Somebody with out-math me here i am sure, but there is a big cause and effect problem with economics, ecascerbated by the fact the most of the variables are organic and emotive rather than rational. Thus, its always been my view that the best discipline to possess is psychology rather than economics. Now i, like many of you perhaps, would have thought that human nature (being the driver) was modelable, but long story short, its not! There are a few "natural number" (what is the term??) rules that certainly do get you somewhat ahead of the pack, eg, Fibonacci levels, Stochastic Oscillators, but the bulk of the analysis we use is of a statistical nature. The bulk of predictive modelling as traded by traders (eg hedge funds, rather than long only investors, eg Franklin, Fidelity etc) is one way or another based around mean reversion, this is a better than average sort of modelling too, and somewhat organic in its origins. The best rules are the simple ones, and the emotive ones, the market is driven by only two basic principles: Fear and Greed. I think for markets a 5 year view isnt too hard (thats macro economic stuff) and a 5 min view isnt so hard (thats trend and momentum) the tough views, and the ones that really pay to get right, are the 6 mth and 1 year views: splitting a chicken is probably as valid a method as any for that!
The interesting thing about bubbles is - everyone knows its a bubble, therefore the only value is picking the catalyst for the correction, not seeing the bubble itself! In the market there is intellectual snobbery associated with being bearish, becuase the great unwashed masses are always bullish and optimistic - i enjoy the irony of the fact that all charts basically start in the bottom left and corner and finish in the top right: therefore, the unwashed masses ploughs over the intellectual bears every time! yay the common man!
Re the question on books: a couple that i and a few others i know in the market have enjoyed; Market Wizards, there was 1 and 2 at least, this is a book of traders anecdotes as is interesting, and, Irrational Exhuberance by Robert Schiller which is an interesting look at late 1990s equity valuations.
Get into the markets, its fun! and even more fun with somebody elses money!!

17. Oct 13, 2007

### math dunce

I came across this question by accident, and although I agree that you probably couldnt be accurate 100% of the time, you could use math to outperform the market. Before I start, I have to admit that I am mathematically challenged. That said, I believe that by picking a small group of stocks (5-25) and assigning numeric value to certain attributes, you would increase your chances of being profitable. I trade stocks daily and average 5% a month. It wont make you a millionaire overnight but you should be able to double your money every 14.4 months. I do this without any algorithms, but, I think if you used math you could make a fortune! At the very least you would lower the risk that the market would slaughter you. I would do it but I can only do so much with my abacas.

18. Jul 22, 2010

### elfboy

I have done work on this this for awhile and have derived equations that describe the mechanics stocks market based on empirical observations. it works by breaking buy & sell orders into individual 'electrons' and 'positrons' and then there are other variables like volume

19. Jul 22, 2010

### cronxeh

god damnit.

20. Jul 22, 2010

### edward

THE ALCHEMISTS OF WALL STREET

An in depth look at Quants. Don't be fooled by the beginning the man is a multi-millionaire.

Last edited by a moderator: Sep 25, 2014